This page provides a user RPL program for calculating the section properties of general shapes. The program has slightly different versions for the HP48 and HP49, both of which are included. To download the program, click here (8 kB zip archive).
The program takes a matrix containing node coordinates as input, and returns the various properties of the section about the orthogonal and principal axes.
A screenshot of the input:
A screenshot of the output:
Detailed instructions are included in the distribution archive. For comments, queries or bug reports, please use this form. I hope that you find it useful.